QGIS API Documentation  3.4.15-Madeira (e83d02e274)
qgsmapcanvassnappingutils.cpp
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1 /***************************************************************************
2  qgsmapcanvassnappingutils.cpp
3  ---------------------
4  begin : December 2014
5  copyright : (C) 2014 by Martin Dobias
6  email : wonder dot sk at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
16 
17 #include "qgsmapcanvas.h"
18 #include "qgsvectorlayer.h"
19 #include "qgssettings.h"
20 
21 #include <QApplication>
22 #include <QProgressDialog>
23 
25  : QgsSnappingUtils( parent, QgsSettings().value( QStringLiteral( "/qgis/digitizing/snap_invisible_feature" ), false ).toBool() )
26  , mCanvas( canvas )
27 
28 {
29  connect( canvas, &QgsMapCanvas::extentsChanged, this, &QgsMapCanvasSnappingUtils::canvasMapSettingsChanged );
30  connect( canvas, &QgsMapCanvas::destinationCrsChanged, this, &QgsMapCanvasSnappingUtils::canvasMapSettingsChanged );
31  connect( canvas, &QgsMapCanvas::layersChanged, this, &QgsMapCanvasSnappingUtils::canvasMapSettingsChanged );
32  connect( canvas, &QgsMapCanvas::currentLayerChanged, this, &QgsMapCanvasSnappingUtils::canvasCurrentLayerChanged );
33  connect( canvas, &QgsMapCanvas::transformContextChanged, this, &QgsMapCanvasSnappingUtils::canvasTransformContextChanged );
34  connect( canvas, &QgsMapCanvas::mapToolSet, this, &QgsMapCanvasSnappingUtils::canvasMapToolChanged );
35  canvasMapSettingsChanged();
36  canvasCurrentLayerChanged();
37 }
38 
39 void QgsMapCanvasSnappingUtils::canvasMapSettingsChanged()
40 {
41  setMapSettings( mCanvas->mapSettings() );
42  setEnableSnappingForInvisibleFeature( QgsSettings().value( QStringLiteral( "/qgis/digitizing/snap_invisible_feature" ), false ).toBool() );
43 }
44 
45 void QgsMapCanvasSnappingUtils::canvasTransformContextChanged()
46 {
47  // can't trust any of our previous locators, as we don't know exactly how datum transform changes would affect these
49  setMapSettings( mCanvas->mapSettings() );
50 }
51 
52 void QgsMapCanvasSnappingUtils::canvasCurrentLayerChanged()
53 {
54  setCurrentLayer( qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() ) );
55 }
56 
57 void QgsMapCanvasSnappingUtils::canvasMapToolChanged()
58 {
59  setEnableSnappingForInvisibleFeature( QgsSettings().value( QStringLiteral( "/qgis/digitizing/snap_invisible_feature" ), false ).toBool() );
60 }
61 
63 {
64  QApplication::setOverrideCursor( Qt::WaitCursor );
65  mProgress = new QProgressDialog( tr( "Indexing data‚Ķ" ), QString(), 0, count, mCanvas->topLevelWidget() );
66  mProgress->setWindowModality( Qt::WindowModal );
67 }
68 
70 {
71  if ( !mProgress )
72  return;
73 
74  mProgress->setValue( index );
75  if ( index == mProgress->maximum() )
76  {
77  delete mProgress;
78  mProgress = nullptr;
79  QApplication::restoreOverrideCursor();
80  }
81 }
QgsMapCanvasSnappingUtils(QgsMapCanvas *canvas, QObject *parent=nullptr)
void setCurrentLayer(QgsVectorLayer *layer)
Sets current layer so that if mode is SnapCurrentLayer we know which layer to use.
This class is a composition of two QSettings instances:
Definition: qgssettings.h:58
void prepareIndexStarting(int count) override
Called when starting to index - can be overridden and e.g. progress dialog can be provided...
const QgsMapSettings & mapSettings() const
Gets access to properties used for map rendering.
void setEnableSnappingForInvisibleFeature(bool enable)
Set if invisible features must be snapped or not.
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:74
void clearAllLocators()
Deletes all existing locators (e.g. when destination CRS has changed and we need to reindex) ...
void prepareIndexProgress(int index) override
Called when finished indexing a layer. When index == count the indexing is complete.
void destinationCrsChanged()
Emitted when map CRS has changed.
void transformContextChanged()
Emitted when the canvas transform context is changed.
void setMapSettings(const QgsMapSettings &settings)
Assign current map settings to the utils - used for conversion between screen coords to map coords...
void currentLayerChanged(QgsMapLayer *layer)
Emitted when the current layer is changed.
QgsMapLayer * currentLayer()
returns current layer (set by legend widget)
This class has all the configuration of snapping and can return answers to snapping queries...
void mapToolSet(QgsMapTool *newTool, QgsMapTool *oldTool)
Emit map tool changed with the old tool.
void extentsChanged()
Emitted when the extents of the map change.
void layersChanged()
Emitted when a new set of layers has been received.